You don?t need many more bandwith for that.

It will
- check the "incoming-URL"
- compare it with DB entrys
- output a realy small site to make a redirektion
look at this code:
PHP Code:
<html>
<head>
<title><?php echo $row[title] ?></title>
<meta name="keywords" content="<?php echo $row[metaauthor] ?>">
<meta name="keywords" content="<?php echo $row[metakeywords] ?>">
<meta name="description" content="<?php echo $row[metadescription] ?>">
<meta name="revisit-after" content="<?php echo $row[metarevisit] ?>">
<meta name="robots" content="<?php echo $row[metarobots] ?>">
</head>
<frameset rows="100%,*" frameborder="NO" border="0" framespacing="0">
<frame name="main" src="<?php echo $target_url ?>">
</frameset>
<noframes>
<body bgcolor="#FFFFFF" text="#000000">
<a href="<?php echo $target_url ?>">Click here to visit <?php echo $row[title] ?>.</a>
</body>
</noframes>
</html>
That is smaler than you index-page I think.